Exploding Soap Bubbles: Hydrogen + OxygenA series of three videos shows that as the ratio of oxygen to hydrogen in soap bubbles increases, the explosions that occur when the bubbles are ignited get louder. (The fact that with an excess of oxygen the explosions would become softer again is not shown.) Each video is repeated with no voice-over so that only the sounds of the explosions are heard. Five still images are provided to show the stoichiometry on the molecular scale. The videos are intended to be shown in order beginning with Hydrogen Alone and ending with hydrogen plus more oxygen.

Thermochemistry : CalcHHessLaw (8 Variations)
The industrial process for making sulfuric acid has three steps. Using the data given, calculate the enthalpy change for the overall reaction for the process (the equation is given below).

The Correlation of Binary Acid Strengths with Molecular Properties in First-Year ChemistryTravis D. FridgenThis article replaces contradictory explanations for the strengths of different binary acids in first-year chemistry textbooks with a single explanation that uses a BornHaber cycle involving homolyic bond dissociation energies, electron affinities, and ion solvation enthalpies to rationalize trends in the strengths of all binary acids.Fridgen, Travis D. J. Chem. Educ.2008, 85, 1220.

Acids / Bases |

Atomic Properties / Structure |

Aqueous Solution Chemistry |

Physical Properties |

Thermodynamics

"Mysteries" of the First and Second Laws of ThermodynamicsRubin BattinoOver the years the subject of thermodynamics has taken on an aura of difficulty, subtlety, and mystery. This article discusses common misconceptions and how to introduce the topic to students.Battino, Rubin. J. Chem. Educ.2007, 84, 753.

Calorimetry / Thermochemistry |

Thermodynamics

Why Chemical Reactions Happen (James Keeler and Peter Wothers)John KrenosBy concentrating on a limited number of model reactions, this book presents chemistry as a cohesive whole by tying together the fundamentals of thermodynamics, chemical kinetics, and quantum chemistry, mainly through the use of molecular orbital interpretations. Krenos, John. J. Chem. Educ.2004, 81, 201.